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Subject[PATCH] dumptrace: x86: consistently include loglevel, print stack switch
Date
 - i386 and x86_64: always printk the 'data' parameter
- i386: announce stack switch (irq -> normal)
- i386: check if there is a stack switch before announcing it

There is a warning that 'context' might come out corrupt in early
boot. If this is true it should be fixed, not worked around.

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
---
arch/x86/kernel/dumpstack_32.c | 17 ++++++-----------
arch/x86/kernel/dumpstack_64.c | 9 +++++++--
2 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 09cd37c..851b692 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -104,16 +104,12 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
context = (struct thread_info *)
((unsigned long)stack & (~(THREAD_SIZE - 1)));
bp = print_context_stack(context, stack, bp, ops, data, NULL);
- /*
- * Should be after the line below, but somewhere
- * in early boot context comes out corrupted and we
- * can't reference it:
- */
- if (ops->stack(data, "IRQ") < 0)
- break;
+
stack = (unsigned long *)context->previous_esp;
if (!stack)
break;
+ if (ops->stack(data, "IRQ") < 0)
+ break;
touch_nmi_watchdog();
}
}
@@ -134,6 +130,7 @@ static void print_trace_warning(void *data, char *msg)

static int print_trace_stack(void *data, char *name)
{
+ printk("%s <%s> ", (char *)data, name);
return 0;
}

@@ -142,11 +139,9 @@ static int print_trace_stack(void *data, char *name)
*/
static void print_trace_address(void *data, unsigned long addr, int reliable)
{
- printk("%s [<%08lx>] ", (char *)data, addr);
- if (!reliable)
- printk("? ");
- print_symbol("%s\n", addr);
touch_nmi_watchdog();
+ printk(data);
+ printk_address(addr, reliable);
}

static const struct stacktrace_ops print_trace_ops = {
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 9e40357..029c141 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -247,24 +247,29 @@ EXPORT_SYMBOL(dump_trace);
static void
print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
{
+ printk(data);
print_symbol(msg, symbol);
printk("\n");
}

static void print_trace_warning(void *data, char *msg)
{
- printk("%s\n", msg);
+ printk("%s%s\n", (char *)data, msg);
}

static int print_trace_stack(void *data, char *name)
{
- printk(" <%s> ", name);
+ printk("%s <%s> ", (char *)data, name);
return 0;
}

+/*
+ * Print one address/symbol entries per line.
+ */
static void print_trace_address(void *data, unsigned long addr, int reliable)
{
touch_nmi_watchdog();
+ printk(data);
printk_address(addr, reliable);
}

--
1.5.4.3


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